This question is an extension of this existing question.
I'm able to add any website link as a hyperlink in Google Calendar, but when I try to add a hyperlink that's not a website link, it doesn't show up as a hyperlink, but the whole a HREF HTML code is seen in the calendar invites.
mobile callers, tap the link for your phone
"<"a href="tel:xxx.xxx.xxxx,,confCode#,,%23">Android / iPhone / Windows Phone
There was a "BT MeetMe" plugin in my Outlook that used to add this hyperlink to my Outlook calendar invites. I'm trying to replicate the same in Google Calendar.